Updates by the community, for the community

Server update, 2014-04-28

Once more now before our upcoming schema change, we’re here with our fortnightly musicbrainz-server release! Some notable changes aside from bug fixes include a few additions to whitelists newly-approved, and enabling thumbnail display for PDF cover art. Thanks to the Internet Archive for making PDF thumbnails work, and thanks to chirlu, nikki, reosarevok, and bitmap for their work this release.